With the general trend, the proportion of new energy vehicles has become more and more, the popularity of new energy vehicles also adds a clear flow to the Che China, but how to buy new energy cars has become a problem. The new energy car is very different from the traditional fuel truck. On the traditional fuel truck, we can directly judge a car driving directly from the engine. How is the fuel consumption, but the new energy car is not, Not only should I look at the engine, but also to see the drive system, watch the battery, but also to watch the PCU, etc., can we determine that this is a new energy car that meets our expectations. Today, let's take a look at this "smart" Lexus RX 450H.
● Introduction to RX 450H Mixed System
Chinese name: wisdom, mix
In the past, the Lexus mixed system has been named by LHD. At present, the Lexus mixed system has a new Chinese name: wisdom and mix.
The third generation of Lexus, not only achieving low emissions, dynamic and economic performance, but also have many enhancements compared to previous generation systems.
It is worth mentioning that the RX 450H uses E-FOUR to drive the motor (AWD model), and the electronic four-wheel drive system is used to implement the front drive and the four-wheel drive mode switching, which can be well adapted to a variety of road conditions, when turning acceleration There is also a better performance and maintain a lower fuel consumption.
Compared with ordinary fuel vehicles, the power unit is relatively complicated. To achieve efficient, engine, motor, transmission system, PCU these four major parts of the company must fully cooperate, can achieve energy conservation and emission reduction.
● Wisdom
3.5L V6 Atkinson Circular Engine
How does the Atkinson loop work? Atkinson's loop work is not complicated. It is based on Otto cycles. By some means to change the compression ratio, the Otto cycle is the circulating method used in most engines. The specific work difference between the two cycles Let's take a look at the picture below.
In this way, under the Atkinson loop, the compression stroke is shortened, while the work stroke does not change, which achieves the expansion ratio greater than the compression ratio, thereby reducing the pump loss, increasing the effective work of the engine.
Atkinson circular engine compared to the Otto circle engine can increase 10% or more efficiency, fuel economy during engine small load work, in high-load, the air-fuel ratio by combining VVT-I and precise control EGR rate in high-load Advance the best ratio and improve fuel economy.
The Atkinson engine is combined with the motor in the mixing system, and the number 1 motor is adjusted by the engine (hereinafter related explanation), which allows this 3.5L displacement of large blocks to work in high-fire range When there is excess energy output, there is battery preservation energy. When necessary, the motor uses the energy in the battery to support the engine.
Lexus's Mixed Core - ECVT
ECVT (Electronic Converse Transmission) is a key component of the Lexus, which is connected to the engine and the motor, controlling the flow of energy, and replaces the traditional transmission.
However, this power distribution institution on RX 450H is slightly different from the power distribution agencies of our common Toyota Group hybrid system, and some optimized upgrades are made in this part.
When the driver usually drive, there is no way to control the engine speed during the best fuel efficiency interval. In most, it is not possible to play the best air efficiency level of the engine, so that the fuel consumption and emissions have risen. Since the driver's way is changed, then another brain will understand the driver's driving intent and control the engine to work in the best air efficiency level.
Lexus's Mixed Core --ph
As the midfield commander on the football field is the core of the entire team's attack and defense transformation. The PCU is the starting point of the hybrid output, used for the direct AC conversion of the generator, and calculates the most efficient combination of two powers in real time.
In the PCU, the transformer converts the DC current of the HV battery into an alternating current used by the motor and generator, and can also convert an alternator from the generator generator and the motor to a direct current that can be charged with the HV battery.
The variable voltage system can make the power supply voltage of the motor and the generator to the maximum DC650V, which means that the DC201.6V of the general situation is generally DC650V, which means that the small current can provide large power supply, and better play high Output the performance of the motor.
In addition, the DC / CD converter in the PCU can reduce the 201.6V direct current from the HV battery and the generator to 12V, supply the vehicle auxiliary equipment, electronic components to use.
Electronic control four-wheel drive, E-FOUR
With the traditional four-wheel drive, there is no drive shaft in the front and rear bridges of the RX 450h, but the electronic drive system is driven to drive the rear axle.
However, the main role of this electrical four-wheel drive system is not to give RX 450h has a unable off-road stripping ability, but to provide passengers with a safe and comfortable driving experience, when driving in a normal road, it is mainly driven.
When the wheel is detected by the wheel sliding, the system will actively start the motor, switch to the four-wheel drive mode, adapt to the road surface, and ensure that the vehicle is comfortable and safely.
NiMH battery pack
The RX 450h still uses a relatively conserved nickel-hydrogen battery.
At the same time, it also detects the battery cooling fan and starts the fault processing system in the discovery problem. The battery is wrapped by a sealed metal casing, and the metal housing material can shield electromagnetic radiation generated by the electrical component, and effectively protect the passenger from electromagnetic fields. At the same time, a collision sensor is installed on the battery. When a collision accident occurs, the signal will be sent immediately to the ECU, interrupt battery power, protect passenger safety.
● Mix system working principle
Pure electric drive + oil electricity mix
Next, we use a picture to find out the working principle of this wisdom and hybrid system!
● Summary:
I remember to have seen this in the official website of Lexus very early: Behind the precision machine, is a heart that is always serving the driver. After the progress of time, the advancement of science and technology, Lexus is further sublimated, so that high-tech and precision machinery serves the driver, with the help of PCU + ECVT, let Lexus RX 450h become wisdom and Luxury coexisteous mixing cars. At the same time, the Lexus Chi-mixing system has supported the social responsibility of the company, and the people-oriented concept is designed and manufactured. On the RX 450h, in addition to the low oil exhaustion of the 智 · 混, you can enjoy the super luxury. Driving experience and very reasonable human machine design make drivers more calm. Read more
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